Dental tool.



J. H. BROWN.

DENTAL TOOL.

APPLICATION FILED NOV. 12. 1915.

Patented Feb. 27, 1917,

A TTORNE Y JOHN H. BROWN, 01? MIDVALE, UTAH.

DENTAL TOOL.

Specification of Letters Patent.

Patented Feb. 27, 1917.

Application filed. November 12, 1915. Serial No. 61,171.

To all whom it may concern:

Be it known that I, JOHN H. BROWN, a citizen of the United States, residing at Midvale, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Dental Tools, of which the following is a specification.

My invention relates to dental tools, and has for its object to provide a device whereby gold crowns and facings for teeth may be easily and quickly formed and made to accurately conform to the surface of the human teeth, and to form a union between a portion of the cusp and the facing that is accurate in form and relative position to each; in order, that when soldering to a bridgethe said parts will not be moved as to each other. Also to form a cusp and back for porcelain facings in which the cusp and back are united, and may be soldered to the other portions of the bridge without the relative position of the parts being misplaced as to each other, also to hold the porcelain facing firmly while forming a united cusp and back for it and in relative position to each.

These objects I accomplish with the device illustrated in the accompanying draw-' ings in which similar letters and numerals of reference indicate like parts throughout the several figures, and as described in the specification forming a part of this application and pointed out in the appended claims.

In the drawings in which I have shown a substantial embodiment of my invention,

Figure 1 is a side elevation of the assembled v device. Fig. 2 is a longitudinal vertical section centrally through the device. Fig. 3 is an end elevation of the assembled device. Fig. I is a view in perspective of the die stocks, one closed and the other open. Fig. 5 is a perspective of the die used to form a front facing. Fig. 6 is a perspective of the stock used to hold a porcelain facing when that class of work is required, and showing a porcelain face for an anterior tooth in place therein. Fig. 7 is a view in perspective of the stock without the porcelain and its retaining wax. Fig. 8 is a side elevation of a gold cusp and facing swaged in the device. Fig. 9 is a side elevation of the die used in connection with the die shown in Fig. 5. Fig. 10 is a side elevation of a cusp, back and porcelain facing.

In constructing gold crowns for teeth, the dentist always desires to give the said work the cusps the most accurate similitude at the cusp and in the walls, also when using porcelain faces, to form an accurate cusp with a united back and assemble the three parts so that only a margin of the gold cusp will show. The present invention enables the dentist to quickly form an accurate cusp and gold facing from one piece of metal which will have the form desired and possess the required strength to hold the said parts in relative position while investing and soldering. Also to quickly form a gold cusp which may be used on any sized tooth of its kind, thus giving a better contact with the opposing tooth, a neater appearance,-and to economize in time, labor and material.

In the drawings illustrating my device, A, is the base plate which may be secured to a table by screws or bolts passed through it and into the table. Two vertical bearing members B are integrally formed on said base plate and are spaced apart to form a longitudinal guide way or channel between them and on the top ofsaid base plate A, and to act as bearings for the lever cam. lever C formed as a cam D at one end is mounted in said'memb'ers B.

I provide and use a set ofdies corresponding to the crowns of the human teeth, and each of which consists of two opposed U- shaped members 1 and 2. They are hingedly connected at one end, as shown at a, and are formed into conforming dies where they meet at the other end, as shown at b. The said members are herein called die stocks E, and are used within the press and under said cam D, where they may receive the force of said lever G. The die portion of the said U-shaped member has two recesses or holes bored into its outer face, shownat 3, to receive the lugs 4 on the back of the teeth facing dies. The said holes 3 are also used to aid in setting a porcelain facing as hereinafter explained. The said U-shaped member 2 has another bracket shaped die stock F pivoted thereto, which holds the facing dies. vThe top or upper end of the vertical portion of the members 2 is out or formed similar to the cusp of a tooth, and the face or lower end of the opposing portion of the member 1 is formed as a counter die. A set of these members 1 and 2 comprise seven in number by which all cusps may be formed, and they are used to form for gold crowns and to give the desired form thereto, each being marked to indicate its class. The said die stocks F each consists of the channel portion 5, within which the dies are held, and the base portion 6 which is pivoted to the member 2 as before explained. An upstanding lug 7 is provided in the bottom of the channel portion 5 to hold the facing dies in longitudinal position until the pressure is applied by the said lever C. A set of dies for forming metal facings is provided, each cut to conform to its particular class of teeth, one of which is shown in Fig. 5. This set of dies consists of metal blocks 9, having a recess 8 in one end of each, which engages with the said lug 7 to hold it longitudinally in place, and the face of the die is cut to conform to the face of a tooth and receive the dies similar to that shown in Fig. 9. When the dentist desires to make a crown and to give a particular form to the wall or face of the tooth, he will select the desired die for the cusp, and the die for the facing, which will be set in holes 3; and in the die stock F thereon he will place the counter face dies, one of which is shown in Fig. 5. The thin strip of gold is then placed between the facing dies and bent backward over the cusp dies, and when pressure is applied in and by means of the press, the cusp and gold facing for the crown is formed similar to that shown in Fig. 8.

When the dentist desires to use a porcelain facing on a tooth in a crown or bridge, he uses the porcelain holding stock, shown in Fig. 7, which consists of a metal block 10, having a recess 8 cut in to one end to engage the said lug 7, and a larger recess 11 cut into the face and opening to the end of the block.

The operation of the device for such use is as follows :The holes 3 in the vertical portion of the member 2 are filled with soft dental wax, and the porcelain face is made to adhere by inserting the pins 14:, which are secured in the back of said porcelain, into said wax. The said recess 11 is next filled with dental wax 12, made plastic by heat, and the metal block 10 is placed within the die stock F. The said porcelain face shown at 13, is transferred from its temporary setting in the soft wax to and is set within the wax 12 by placing the die stocks E and F within the press and applying the force of the lever C. This will cause the die stock F to swing on its pivot 15 upwardly, and the bottom of the member 2' and of the part 6 will assume the same plane, and contact with the upper face of the longitudinal guide way in the base plate A. When the die stocks are opened the porcelain 13 will be set in the metal block 10, as shown in Fig. 6, with the back of the porcelain, wax 12, and face of said metal block 10 in one plane, and the pins 14 extending above the U-shaped,

plane. The gold for the cusp of the tooth and forforming the back on the porcelain facing is then swaged into shape by taking a strip of gold of the required width and punching two small holes therein to receive the said pins 14; then placing this strip of punctured gold between the vertical portion of said member 2 and the channel portion of the die stock F as filled with the loaded metal block 10; then bending the strip of gold backwardly at the outer upper edge of the block 10 at practically right angles, and applying the force of the lever C, which will swage the cusp and back into the required form, as shown in Fig. 10. When the cusp and back are removed from the dies, the porcelain may be removed from the block 10 and soldered to the crown or bridgeworlr as required.

Having thus described my invention ll desire to secure by Letters Patent and claim 1. In a dental tool the combination with a press having a guide way formed in its upper face, of hingedly connected members having their opposing free ends cut as coacting tooth dies, with holes formed in the face of one of said free ends; a die stock pivoted to the member having said holes therein; a die adapted to be held in said holes; and a counter die carried in said die stock.

2. A dental tool consisting of a hingedly connected pair of coacting dies having holes bored in the outer face of one; a die stock pivoted thereto adjacent said holes; a die carried in said holes; a counter die carried in said die stock; and means to force the first mentioned dies toward each other and the said counter die toward the die carried in said holes.

8. A dental tool consisting of coacting dies having holes bored in the side of one of them; a die carried in said holes; a die stock pivoted adjacent said holes; and a press to force said coacting dies toward each other and move said die stock on its pivot toward the die carried in said holes.

4. A dental tool consisting of hingedly connected coacting dies; a die stock pivoted to one of said dies; and means to force said dies toward each other and move said die stock on its pivot toward the side of one of said dies.

5. A dental tool consisting of a pair of dies; means to hold them in alinement; a die stock pivoted to one of said dies; and means to force said dies toward each other and said die stock toward the side of one of said dies.

6. In a dental tool the combination of a base plate; spaced apart standards integral therewith; a lever pivoted between said standards; a pair of hingedly connected dies adapted for use between said standards and with holes in the side of one of them; a' set of dies having lugs thereon which are adapted to seat in said holes; a die stock piv- 1 0 oted adjacent said holes; and a set of dies each adapted to be carried in said stock and to coact with the die carried in said holes.

7 In a dental tool the combination of a base plate; spaced apart standards integral thereon; a lever having a cam thereon mounted in said standards; a pair of hingedly connected members adapted to slide between said standards and Whose free ends are cut as coacting dies and having holes in the side of one; a set of dies out similar to the sides of the human teeth and each provided With lugs which are adapted to seat in Copies of this patent may be obtained for five cents each, by addressing the said holes; a die stock pivoted adjacent said holes consisting of a base portion and a channel portion; an upstanding lug in the bottom of said channel portion; and a set of counter dies engaging said lug in said die stock and coacting with the cooperating die of the other set to form the facing for teeth.

In testimony whereof I have aflixed my signature in presence of a Witness.

JOHN H. BROWN. Witness:

SAM RANEY.

Commissioner of Patents,

Washington, D. G. 

